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authorTavian Barnes <tavianator@tavianator.com>2014-08-19 17:10:03 -0400
committerTavian Barnes <tavianator@tavianator.com>2015-10-25 11:03:56 -0400
commit7b09710392d35fb55b52031d447a542d99fc6b4b (patch)
tree270eb927ee8c52ceeb99926ebf4843704775a610 /libdimension/dimension/concurrency
parent200c86b91ea7063d35be3bffc11c5da53c054653 (diff)
downloaddimension-7b09710392d35fb55b52031d447a542d99fc6b4b.tar.xz
Modularize the libdimension codebase.
Diffstat (limited to 'libdimension/dimension/concurrency')
-rw-r--r--libdimension/dimension/concurrency/future.h85
1 files changed, 85 insertions, 0 deletions
diff --git a/libdimension/dimension/concurrency/future.h b/libdimension/dimension/concurrency/future.h
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+/*************************************************************************
+ * Copyright (C) 2009-2014 Tavian Barnes <tavianator@tavianator.com> *
+ * *
+ * This file is part of The Dimension Library. *
+ * *
+ * The Dimension Library is free software; you can redistribute it and/ *
+ * or modify it under the terms of the GNU Lesser General Public License *
+ * as published by the Free Software Foundation; either version 3 of the *
+ * License, or (at your option) any later version. *
+ * *
+ * The Dimension Library is distributed in the hope that it will be *
+ * useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
+ * Lesser General Public License for more details. *
+ * *
+ * You should have received a copy of the GNU Lesser General Public *
+ * License along with this program. If not, see *
+ * <http://www.gnu.org/licenses/>. *
+ *************************************************************************/
+
+/**
+ * @file
+ * An interface for asynchronous tasks. *_async() versions of functions
+ * return a dmnsn_future* object which can indicate the progress of the
+ * background task, and wait for task completion. The task's return value
+ * is returned as an int from dmnsn_finish_progress().
+ */
+
+#ifndef DMNSN_CONCURRENCY_H
+#error "Please include <dimension/concurrency.h> instead of this header directly."
+#endif
+
+#include <stdbool.h>
+
+/** A future object. */
+typedef struct dmnsn_future dmnsn_future;
+
+/**
+ * Join the worker thread and return its integer return value in addition to
+ * deleting \p future.
+ * @param[in,out] future The background task to join.
+ * @return The return value of the background task.
+ */
+int dmnsn_future_join(dmnsn_future *future);
+
+/**
+ * Interrupt the execution of a background thread.
+ * @param[in,out] future The background task to cancel.
+ */
+void dmnsn_future_cancel(dmnsn_future *future);
+
+/**
+ * Get the progress of the background task.
+ * @param[in] future The background task to examine.
+ * @return The progress of the background task, in [0.0, 1.0].
+ */
+double dmnsn_future_progress(const dmnsn_future *future);
+
+/**
+ * Find out if a background task is finished.
+ * @param[in] future The background task to examine.
+ * @return true if the task is done, false otherwise.
+ */
+bool dmnsn_future_is_done(const dmnsn_future *future);
+
+/**
+ * Wait for a certain amount of progress. Always use this rather than
+ * spinlocking.
+ * @param[in] future The background task to monitor.
+ * @param[in] progress The progress value to wait for.
+ */
+void dmnsn_future_wait(const dmnsn_future *future, double progress);
+
+/**
+ * Pause all threads working on the given future. Once this function returns,
+ * it is safe to examine the intermediate state of the asynchronous computation.
+ * @param[in,out] future The background task to pause.
+ */
+void dmnsn_future_pause(dmnsn_future *future);
+
+/**
+ * Resume a previously paused future object.
+ * @param[in,out] future The background task to resume.
+ */
+void dmnsn_future_resume(dmnsn_future *future);